JP5014172B2 - Contact prevention device - Google Patents

Description

  The present invention relates to a contact prevention device used at the time of maintenance / inspection of a switchgear having a drawer type circuit breaker.

  2. Description of the Related Art A switchgear having a drawer type circuit breaker is known as a device that shuts off a power supply system when stopping operation of various devices in a substation or the like. The switchgear stores a drawer type circuit breaker having a movable contact terminal in a storage chamber inside the box, and connects the movable contact terminal of the drawer type circuit breaker with the fixed contact terminal of the main circuit protruding into the storage chamber. The system is connected. When performing maintenance / inspection, the drawer type circuit breaker is pulled out of the storage room and the movable contact terminal and the fixed contact terminal are disconnected to open the power supply system.

  Here, when carrying out maintenance and inspection by pulling out the drawer type circuit breaker from the storage room, the fixed contact terminal is exposed in the storage room. There is a risk of accidents such as electric shock coming into contact. For this reason, for example, there is one that opens and closes a shutter provided to face the fixed contact terminal in accordance with the withdrawal of the drawer-type circuit breaker (for example, see Patent Document 1).

JP 2002-335610 A

  By adopting such a shutter mechanism, the fixed contact terminal is blocked by the shutter during maintenance / inspection work, so that it is possible to prevent accidents such as an operator coming into contact with the fixed contact terminal and receiving an electric shock. it can. However, the mechanism is complicated, and it is difficult to adopt it for existing facilities, and there is also a problem that enormous capital investment is newly required to adopt such a mechanism.

  This invention is made in view of such a situation, and provides the contact prevention apparatus which can prevent the contact to an operator's fixed contact terminal reliably, and is relatively cheap and can be installed. Objective.

  A first aspect of the present invention that solves the above problem is a drawer type that has movable contact terminals that are retractably stored in a storage portion of a box and that are respectively connected to a plurality of fixed contact terminals having one end connected to a main circuit. A contact prevention device used for a switchgear having a circuit breaker and substantially covering a protective cover provided around the fixed contact terminal to prevent contact with the fixed contact terminal, the plurality of the protective covers Is formed with a stretchable member made of a stretchable material, and part of opposite side wall portions in the long side direction of the insert groove is formed by a stretchable material. The contact prevention device is characterized in that the length in the long side direction of the insertion groove is adjustable.

  According to a second aspect of the present invention, the first and second engaging members, which are made of a hard material and engage with the protective cover inserted into the insertion groove, are connected by the elastic member. The contact preventing device according to the first aspect is characterized in that the engaging member and the second engaging member are slidably engaged along the long side direction of the insertion groove.

  According to a third aspect of the present invention, there is provided a first beam and a second beam extending along the long side direction of the insertion groove from the respective support portions erected on the first and second engaging members. The contact prevention device according to the second aspect is characterized in that the first and second beam portions are slidably engaged with each other.

  In a fourth aspect of the present invention, the first and second engaging members include a rack member provided on one of the first or second engaging members and a pinion gear provided on the other. The contact prevention device according to the second or third aspect is characterized in that it can be moved in the long side direction of the insertion groove by a rack and pinion mechanism.

  According to a fifth aspect of the present invention, the first and second engagements are performed by a ratchet mechanism including a ratchet tooth provided on a rack member constituting the rack and pinion mechanism and a lock pin engaged with the ratchet tooth. In the contact prevention device according to any one of the second to fourth aspects, the member is restricted from moving in a direction in which the distance between the members is narrowed, and the lock pin is detachably provided. .

  Since the contact prevention device of the present invention can cover a plurality of fixed contact terminals at a time, it can relatively easily and reliably prevent contact with the fixed contact terminals. For example, maintenance / inspection of switchgear During work, it is possible to prevent an accident such as an electric shock caused by an operator touching the fixed contact terminal. Moreover, since it mounts | wears with respect to a some fixed contact terminal (protective cover), since the opportunity that an operator contacts a fixed contact terminal reduces, the safety | security at the time of mounting | wearing a contact prevention apparatus is also improved significantly. Furthermore, since the contact prevention apparatus of this invention can be employ | adopted for the existing apparatus, it can also suppress capital investment.

Hereinafter, the present invention will be described in detail based on embodiments.
FIG. 1 is a side view showing an example of a switch gear, FIG. 2 is a schematic perspective view of a contact prevention device according to the present invention, and FIG. 3 is a top view and a side view thereof. FIG. 4 is an enlarged cross-sectional view showing a part of the contact prevention device.

  As shown in FIG. 1, the switchgear 10 is used, for example, in a power generating / transforming facility or the like, and is stored in a box 11 provided with a switchboard (main circuit), and a storage chamber 12 of the box 11. And a drawer type circuit breaker (breaker) 13. The drawer-type circuit breaker (breaker) 13 has a circuit breaker body 14 fixed on a carriage 15 and is linearly movable on a rail 16 provided on the bottom surface of the storage chamber 12. The circuit breaker body 14 is a so-called vacuum circuit breaker, which utilizes the arc extinguishing force and insulation performance of an excellent vacuum. Since the arc generated at the time of opening is diffused at high speed in a vacuum, it is easy. Has an advantage that a large current can be cut off.

  During operation of the power generation and substation equipment, the drawer type circuit breaker (breaker) 13 is pushed into the storage chamber 12 of the box 11 to connect the circuit breaker main body 14 to the main circuit, and during maintenance and inspection of the switchgear 10. For example, a draw-out type circuit breaker (breaker) 13 is drawn out of the box 11 from the storage chamber 12 to open the circuit breaker body 14 to the main circuit.

  Specifically, a fixed contact terminal 17 connected to the main circuit is provided on the rear surface side of the box 11 so as to protrude in the storage chamber 12 in a substantially horizontal direction. For example, a plurality of fixed contact terminals 17 connected to the three-phase buses of the main circuit are provided. A cylindrical protective cover 18 made of an insulating material is provided around each fixed contact terminal 17 protruding into the storage chamber 12. On the other hand, a plurality of movable contact terminals 19 corresponding to each fixed contact terminal 17 are provided on the rear surface side of the circuit breaker body 14, that is, the surface facing the fixed contact terminal 17 so as to protrude in a substantially horizontal direction. A cylindrical protective cover 18 made of an insulating material is also provided around each movable contact terminal 19 in the same manner as the periphery of the fixed contact terminal 17. The breaker body 14 is stored in the storage chamber 12 so that the movable contact terminal 19 is connected to the fixed contact terminal 17, and the movable contact terminal 19 is released from the fixed contact terminal 17 by being pulled out of the storage chamber 12. It has become so.

  Such maintenance / inspection work of the switchgear 10 is performed with the circuit breaker main body 14 pulled out from the storage chamber 12 to the outside of the box 11. At this time, the fixed contact terminal 17 is exposed in the storage chamber 12. If this is the case, there is a risk that an accident such as an electric shock caused by an operator coming into contact with the fixed contact terminal 17 may occur. For this reason, in the present invention, when the circuit breaker body 14 is pulled out from the storage chamber 12, the following contact prevention device 30 is mounted. That is, the plurality of protective covers 18 are substantially covered by the contact prevention device 30 to prevent an accident such as an operator coming into contact with the fixed contact terminal 17 and receiving an electric shock.

  As shown in FIGS. 2 to 4, the contact prevention device 30 of the present invention has an insertion groove 31 having a long groove shape into which a plurality of protective covers 18 corresponding to the respective fixed contact terminals 17 are inserted. A part of the wall in the long side direction is formed of a stretchable elastic member 32 so that the length of the insertion groove 31 in the long side direction can be adjusted. Specifically, the contact prevention device 30 includes, for example, a first engagement member 34A and a second engagement member which are made of a hard material such as plastic and hard rubber and are provided with an engagement recess 33 that engages with the protective cover 18. The first engaging member 34A and the second engaging member 34B are connected by a pair of elastic members 32 to form an insertion groove 31. That is, the insertion groove 31 is defined by the elastic member 32 between the engagement recess 33 provided in the first and second engagement members 34A, 34B and the first and second engagement members 34A, 34B. And a space portion 35. In the present embodiment, the engagement recesses 33 provided in the first and second engagement members 34 </ b> A and 34 </ b> B are separated from the space 35 by the partition wall 36. Of course, each engagement recess 33 and the space 35 may be communicated with each other without providing the partition wall 36. Further, the length of the insertion groove 31 in the short side direction is slightly wider than the diameter of the protective cover 18.

  Here, the elastic member 32 is made of a material having elasticity as a characteristic, such as a rubber material. Moreover, in this embodiment, the expansion-contraction member 32 is formed in the bellows shape. Of course, the elastic member 32 does not necessarily need to be formed in a bellows shape.

  Support portions 37A and 37B are erected on the first and second engaging members 34A and 34B, respectively, and the first beam portion 38A extending along the long side direction of the insertion groove 31 and The second beam portion 38B is supported by the support portions 37A and 37B. For example, in the present embodiment, the first beam portion 38A and the second beam portion 38B are extended along the long side direction of the insertion groove 31 from the center of the top of the support portions 37A and 37B. The first and second beam portions 38A, 38B are engaged and held so as to be slidable along the long side direction of the insertion groove 31. For example, in the present embodiment, a groove 39 is formed on the lower surface side of the second beam portion 38B, and the first beam portion 38A is slidably engaged and held in the groove 39 of the second beam portion 38B. .

  The first and second engaging members 34A and 34B are held by a rack and pinion mechanism so as to be movable in the long side direction (left and right direction in FIG. 3) of the insertion groove 31. For example, in the present embodiment, a rod-shaped rack member 40 is provided between the first and second engaging members 34A and 34B. In this embodiment, one end side of the rack member 40 is fixed to the second engagement member 34B, and the other end side is a through hole provided in the support portion 37A of the first engagement member 34A. It is inserted. A projecting portion 41 projecting in the short side direction of the insertion groove 31 is provided at a substantially central portion of the first beam portion 38A, and a pinion gear 42 is provided on the lower surface side of the projecting portion 41 of the rack member 40. It is rotatably held in a state of meshing with rack teeth 43 provided on the side surface. A rotation handle 45 is connected to the rotation shaft 44 of the pinion gear 42, and by rotating the rotation handle 45, the interval between the first engagement member 34A and the second engagement member 34B, that is, insertion. The length of the groove 31 in the long side direction can be adjusted.

  Further, in the present embodiment, a ratchet mechanism including a ratchet tooth 46 provided on the upper surface of the rack member 40 and a lock pin 47 engaged with the ratchet tooth 46 is provided. By this ratchet mechanism, the first engagement member 34A and the second engagement member 34B are allowed to move in the direction in which the distance between the first engagement member 34A and the second engagement member 34B is increased, and the movement in the direction in which the distance between both is reduced is restricted. . Specifically, as shown in the enlarged cross-sectional view of FIG. 4, a plurality of ratchet teeth 46 are provided on the upper surface of the rack member 40, while a lock pin 47 is provided on the protruding portion 41 in a region facing the ratchet teeth 46. Is fixed. The lock pin 47 is, for example, in a state where the needle-like contact member 48 is urged downward, that is, toward the ratchet teeth 46 by a biasing member 50 such as a coil spring disposed in the lock pin main body 49. Is retained. In such a configuration, when the first and second engaging members 34A and 34B are slid in the direction in which the distance between the first and second engaging members 34A and 34B is increased (indicated by an arrow in the figure), the contact member 48 of the lock pin 47 is ratchet Since the sliding is performed on the inclined surface of the tooth 46, the first and second engaging members 34A and 34B are allowed to move. On the other hand, even if the first and second engaging members 34A and 34B are slid in the direction in which the distance between the two engaging members 34A and 34B is reduced, the contact member 48 of the lock pin 47 is locked to the ratchet teeth 46. The movement of the second engagement members 34A and 34B is restricted. The lock pin 47 is detachably fixed to the protruding portion 41. When the lock pin 47 is removed in a state where the distance between the first and second engaging members 34A and 34B is widened, that is, in a state where the expansion / contraction member 32 is extended, the first and second engagement members 34A and 34B are contracted by the force that the expansion / contraction member 32 contracts. The interval between the first and second engaging members 34A and 34B is narrowed.

  Such a contact prevention device 30 is attached to a plurality of fixed contact terminals 17 provided in the box 11 of the switchgear 10. For example, in this embodiment, as shown in FIG. 5, in the box 11 of the switchgear 10, three fixed contact terminals 17 respectively connected to the three-phase buses are arranged in a row to prevent contact. The device 30 is attached to these three fixed contact terminals 17. Actually, it is attached to a protective cover 18 provided around each fixed contact terminal 17.

  Hereinafter, a mounting procedure of such a contact prevention device 30 will be described. First, by rotating the rotary handle 45, as shown in FIG. 6, the first and second engaging members 34A and 34B are slid while the expansion member 32 is extended to widen the distance therebetween. . Specifically, the length L1 in the long side direction of the insertion groove 31 is wider than the length L2 (see FIG. 5) between the protective covers 18 provided around the three fixed contact terminals 17. The first and second engaging members 34A and 34B are slid. At this time, the first and second engaging members 34A and 34B are pulled by the elastic member 32, but since the lock pin 47 is locked by the ratchet teeth 46 as described above, It is held at a predetermined interval.

  Next, with the space between the first and second engaging members 34A and 34B widened as described above, the contact prevention device 30 is mounted on the three protective covers 18 as shown in FIG. To do. At this time, the length L1 in the long side direction of the insertion groove 31 is wider than the length L2 between the protective covers 18 as described above, and the inner surface of the insertion groove 31 and the protective cover in the long side direction of the insertion groove 31. Since a slight gap is secured between the contact cover 18 and the protective cover 18, the contact preventing device 30 can be easily attached to the protective cover 18.

  Thereafter, the lock pin 47 is pulled out from the projecting portion 41 with the contact prevention device 30 mounted on the protective cover 18 as described above. As a result, as shown in FIG. 7B, the first and second engaging members 34A and 34B are narrowed in the direction in which the space between the first and second engaging members 34A and 34B is contracted by the contracting force of the elastic member 32, that is, It slides in the direction in which the length in the side direction becomes shorter, and each of the first and second engaging members 34A, 34B comes into contact with the protective cover 18 and stops. Then, each of the first and second engaging members 34A, 34B is fixed in a state of being biased toward the protective cover 18 by the contraction force of the expansion / contraction member 32.

  Thereby, each fixed contact terminal 17 is substantially covered with this contact prevention device 30. In the present embodiment, since the engagement recesses 33 of the first and second engagement members 34A, 34B are closed on the surface on the support portion 37 side, the fixed contact terminals 17 inserted into the respective engagement recesses 33. Is completely covered by the contact prevention device 30. On the other hand, the space portion 35 is a through-hole that also opens the surface on the support portion 37 side. However, since the first and second beam portions 38A and 38B extend in a region facing the space portion 35, the space portion The fixed contact terminal 17 inserted into the 35 is also substantially covered with the contact preventing device 30. Further, since each of the first and second engaging members 34A and 34B is urged toward the protective cover 18 by the contraction force of the expansion and contraction member 32, there is no possibility that the contact prevention device 30 falls off the protective cover 18. .

  Therefore, by performing the maintenance / inspection work of the switchgear with the contact prevention device mounted in this way, it is possible to prevent the occurrence of an accident such as an operator touching the fixed contact terminal and electric shock.

  Furthermore, since the contact prevention apparatus 30 of this invention can cover the several fixed contact terminal 17 at once, workability | operativity improves significantly. Moreover, since the opportunity for an operator to contact the fixed contact terminal 17 decreases, the safety at the time of mounting | wearing the contact prevention apparatus 30 is also improved significantly. Furthermore, since the contact prevention apparatus 30 of this invention can be employ | adopted for the existing apparatus, capital investment can also be suppressed.

  As mentioned above, although one Embodiment of this invention was described, it cannot be overemphasized that a various change is possible for this invention in the range which is not limited to this Embodiment and does not deviate from the summary.

It is a side view which shows an example of a switchgear. It is a schematic perspective view of the contact prevention apparatus which concerns on this invention. It is the top view and side view of a contact prevention device concerning the present invention. It is an expanded sectional view showing a part of contact prevention device concerning the present invention. It is a front view which shows the box of a switchgear. It is a figure which shows the mounting procedure of the contact prevention apparatus which concerns on this invention. It is a figure which shows the mounting procedure of the contact prevention apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Switch gear 11 Box 12 Storage chamber 13 Pull-out type circuit breaker 14 Circuit breaker main body 16 Rail 17 Fixed contact terminal 18 Protective cover 19 Movable contact terminal 30 Contact prevention device 31 Insertion groove 32 Telescopic member 33 Engaging recess 34A, 34B Engagement Member 35 Space portion 36 Bulkhead 37A, 37B Support portion 38A, 38B Beam portion 39 Groove portion 40 Rack member 41 Projection portion 42 Pinion gear 43 Rack teeth 44 Rotating shaft 45 Rotating handle 46 Ratchet teeth 47 Lock pin 48 Contact member 49 Lock pin body 50 Biasing member

Claims (5)

The fixed contact is used in a switchgear having a drawer-type circuit breaker having a movable contact terminal that is connected to a plurality of fixed contact terminals, one end of which is retractably stored in a storage part of the box and connected to the main circuit. A contact prevention device that substantially covers a protective cover provided around the terminal and prevents contact with the fixed contact terminal,
A plurality of the protective covers are inserted into a long groove-shaped insertion groove, and part of opposite side wall portions in the long side direction of the insertion groove is formed of an elastic member made of a stretchable material. A contact prevention device characterized in that the length of the insertion groove in the long side direction can be adjusted by expansion and contraction of the member.   A first and second engaging member made of a hard material and engaged with the protective cover inserted into the insertion groove is connected by the expansion and contraction member, and the first engaging member and the second engaging member are connected. The contact preventing device according to claim 1, wherein the member is slidably engaged along a long side direction of the insertion groove.   First and second beam portions extending along the long side direction of the insertion groove from the respective support portions erected on the first and second engaging members. The contact preventing device according to claim 2, wherein the second beam portion is slidably engaged.   The first and second engaging members are inserted into the insertion groove by a rack and pinion mechanism including a rack member provided on one of the first and second engaging members and a pinion gear provided on the other. The contact prevention device according to claim 2, wherein the contact prevention device is movable in a long side direction.   The first and second engaging members are narrowed by a ratchet mechanism including a ratchet tooth provided on a rack member constituting the rack and pinion mechanism and a lock pin engaged with the ratchet tooth. The contact prevention device according to any one of claims 2 to 4, wherein the movement of the lock pin is restricted and the lock pin is detachably provided.

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